def _ipam_get_subnets(self,
context,
network_id,
host,
service_type=None,
fixed_configured=False):
"""Return eligible subnets
If no eligible subnets are found, determine why and potentially raise
an appropriate error.
"""
subnets = self._find_candidate_subnets(context, network_id, host,
service_type, fixed_configured)
if subnets:
subnet_dicts = [
self._make_subnet_dict(subnet, context=context)
for subnet in subnets
]
# Give priority to subnets with service_types
return sorted(subnet_dicts,
key=lambda subnet: not subnet.get('service_types'))
# Determine why we found no subnets to raise the right error
query = self._query_subnets_on_network(context, network_id)
if self.is_host_set(host):
# Empty because host isn't mapped to a segment with a subnet?
s_query = query.filter(models_v2.Subnet.segment_id.isnot(None))
if s_query.limit(1).count() != 0:
# It is a routed network but no subnets found for host
raise segment_exc.HostNotConnectedToAnySegment(
host=host, network_id=network_id)
if not query.limit(1).count():
# Network has *no* subnets of any kind. This isn't an error.
return []
# Does filtering ineligible service subnets makes the list empty?
query = self._query_filter_service_subnets(query, service_type)
if query.limit(1).count():
# No, must be a deferred IP port because there are matching
# subnets. Happens on routed networks when host isn't known.
raise ipam_exceptions.DeferIpam()
raise ipam_exceptions.IpAddressGenerationFailureNoMatchingSubnet(
network_id=network_id, service_type=service_type)
def network_has_no_subnet(cls, context, network_id, host, service_type):
# Determine why we found no subnets to raise the right error
query = cls.query_subnets_on_network(context, network_id)
if cls.is_host_set(host):
# Empty because host isn't mapped to a segment with a subnet?
s_query = query.filter(cls.db_model.segment_id.isnot(None))
if s_query.limit(1).count() != 0:
# It is a routed network but no subnets found for host
raise segment_exc.HostNotConnectedToAnySegment(
host=host, network_id=network_id)
if not query.limit(1).count():
# Network has *no* subnets of any kind. This isn't an error.
return True
# Does filtering ineligible service subnets makes the list empty?
query = SubnetServiceType.query_filter_service_subnets(
query, service_type)
if query.limit(1).count():
# No, must be a deferred IP port because there are matching
# subnets. Happens on routed networks when host isn't known.
raise ipam_exceptions.DeferIpam()
return False
